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xen/x86: generalize preferred console model from PV to PVH Dom0 

Without announcing hvc0 as preferred it won't get used as long as tty0
gets registered earlier. This is particularly problematic with there not
being any screen output for PVH Dom0 when the screen is in graphics
mode, as the necessary information doesn't get conveyed yet from the
hypervisor.

Follow PV's model, but be conservative and do this for Dom0 only for
now.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/582328b6-c86c-37f3-d802-5539b7a86736@suse.com
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Jan Beulich 2021-09-30 14:19:16 +02:00 committed by Juergen Gross
parent 42bc9716bc
commit 4d1ab432ac
4 changed files with 18 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
arch/x86/xen/enlighten.c
View File

@ -3,6 +3,7 @@
#ifdef CONFIG_XEN_BALLOON_MEMORY_HOTPLUG
#include <linux/memblock.h>
#endif
#include <linux/console.h>
#include <linux/cpu.h>
#include <linux/kexec.h>
#include <linux/slab.h>
@ -18,6 +19,7 @@
#include <asm/xen/hypervisor.h>
#include <asm/cpu.h>
#include <asm/e820/api.h>
#include <asm/setup.h>
#include "xen-ops.h"
#include "smp.h"
@ -274,6 +276,16 @@ bool xen_running_on_version_or_later(unsigned int major, unsigned int minor)
return false;
}
void __init xen_add_preferred_consoles(void)
{
add_preferred_console("xenboot", 0, NULL);
if (!boot_params.screen_info.orig_video_isVGA)
add_preferred_console("tty", 0, NULL);
add_preferred_console("hvc", 0, NULL);
if (boot_params.screen_info.orig_video_isVGA)
add_preferred_console("tty", 0, NULL);
}
void xen_reboot(int reason)
{
struct sched_shutdown r = { .reason = reason };

8
arch/x86/xen/enlighten_pv.c
View File

@ -28,7 +28,6 @@
#include <linux/mm.h>
#include <linux/page-flags.h>
#include <linux/highmem.h>
#include <linux/console.h>
#include <linux/pci.h>
#include <linux/gfp.h>
#include <linux/edd.h>
@ -1392,12 +1391,7 @@ asmlinkage __visible void __init xen_start_kernel(void)
#endif
}
add_preferred_console("xenboot", 0, NULL);
if (!boot_params.screen_info.orig_video_isVGA)
add_preferred_console("tty", 0, NULL);
add_preferred_console("hvc", 0, NULL);
if (boot_params.screen_info.orig_video_isVGA)
add_preferred_console("tty", 0, NULL);
xen_add_preferred_consoles();
#ifdef CONFIG_PCI
/* PCI BIOS service won't work from a PV guest. */

3
arch/x86/xen/enlighten_pvh.c
View File

@ -36,6 +36,9 @@ void __init xen_pvh_init(struct boot_params *boot_params)
pfn = __pa(hypercall_page);
wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32));
if (xen_initial_domain())
x86_init.oem.arch_setup = xen_add_preferred_consoles;
xen_efi_init(boot_params);
}

2
arch/x86/xen/xen-ops.h
View File

@ -118,6 +118,8 @@ static inline void __init xen_init_vga(const struct dom0_vga_console_info *info,
}
#endif
void xen_add_preferred_consoles(void);
void __init xen_init_apic(void);
#ifdef CONFIG_XEN_EFI